The campaign of Bernard Sanders said Tuesday that the Vermont senator will not participate in Thursday’s planned debate unless Hillary Clinton agrees to further debates.

Tad Devine, a Sanders campaign official, told The Hill on Tuesday that the sticking point is a debate in New York, the state which elected Mrs. Clinton to two U.S. Senate terms. The Sanders team wants a debate there, and Mrs. Clinton doesn’t, he said.

“We are continuing to negotiate with them not just about the debate Thursday night, but about the other debates that we have said need to be agreed to in order to put the whole package of debates together,” Mr. Devine said. “They have not agreed to at least one aspect of it, which is we’ve asked for a debate in New York.”

Thursday’s New Hampshire debate is scheduled for 9 p.m. on MSNBC with Rachel Maddow and Chuck Todd as moderators.

“I sure hope — we’re in Bernie Sanders’ backyard here in New Hampshire — I sure hope he intends to show up in his neighboring state,” Mrs. Clinton told CNN on Tuesday.